Before getting to the Watch, I'd gotten all top gear (Hermetic/Druidic, etc) and put blue infusions of them. At the Watch, after a few quests, I was gifted 2 T4 Durability Infusions. When I attempted to put one on a Blue tier 3 item with Durability 30, it showed Durability 10 if I proceeded. Not wanting to destroy a good piece, I cancelled the action. It appears this issue has been addressed fairly well ingame. Consider the thread closed, for me, at least.
Hmmm...4 days since this was posted, and still no response? Shameful. This, and other questions about T4 Infusions have been asked DOZENS OF TIMES and the devs have yet to answer any of them. I can't help thinking that this, along with the discord, is just a funnel to keep us from expressing our frustration in the form of a negative review...perhaps that is what will get their attention.